Interconnected nanopores as a continuous phase throughout the matrix have been interested in various field using molecular separation and storage, catalyst, or catalyst support materials. In particular, we have been interested in the possibility as catalyst support materials. Following previous researches, immobilizing catalysts to the solid support is not only facilitating catalyst recovery and simplifying of the reaction work-up, but even affects improvement of the catalytic efficiency or reaction rate. Thus, in this study, we report the immobilization of Ru(‖) based catalysts on polyurea network based nanoporous frameworks.
Previously, we discussed the polymerization of multifunctional amine-isocyanate pair induces the dispersion (sol) of nano-particulate polyurea networks in organic solvent below a concentration of gelation. The method enables facile solution-processing of insoluble covalent molecular network. We fabricate biconinuous nanoporous membrane via interplay of phase separation between urea network and polymer or inorganic precursor and sol-gel transition. The Ru(‖) based catalysts are immobilized physically or chemically by using the interaction between the catalyst and the support; covalent binding, adsorption. The immobilized catalyst is confirmed by electron microscopy (SEM, TEM) and XPS. We investigate how the composition ratio and formation temperature of nanoporous networks affect its nanoporous channel and explored experimental conditions optimized for catalyst immobilization. Then, we also explore the catalytic efficiency and stability of the catalyst on the membrane.